Cannabicyclol (CBL), discovered by Korte and Sieper in 1964 is a non-psychoactive cannabinoid that was initially thought to be THC and named THC III. In 1967 however, after a careful conversion from CBC, isolation, and study, CBL was renamed. In 1971, its proper structure was discovered and it was also confirmed that CBL is not a naturally occurring cannabinoid. As is common with other cannabinoids, CBL is derived from the decarboxylation of CBC as a result of exposure to light or oxygen. It is also sometimes referred to as cannabipinol or CBP.